Inclined Piezocone Penetration Aspects - Theoretical Interpretation and Experiment Verification

* 9907951图梅美国地面建筑和地下基础设施的快速增长和繁荣城市和郊区对岩土工程的需求增加。岩土工程师正面临着越来越多的挑战，以改善原位测试工具，以准确地描述土壤特性和有效地评估几何改良。压锥测深仪测试（PCPT）是一种简单、快速、可重复的测试方法，可以提供地下的连续测深。PCPT试验数据可有效地用于土的地层学研究、识别和工程土的性质评价，而目前在现场勘察中使用的压锥法仅限于垂直试验。由于存在障碍物和/或缺乏通道，锥形流量计的垂直侵入并不总是可能的。此外，在许多情况下，由于土壤的性质（即垫层、倾斜基础）或加固结构（即土钉、斜桩）的排列，需要倾斜平面处的土壤强度参数和/或流动特性。压电锥在斜侵彻中的应用还没有得到彻底的研究。 本研究的主要目的是通过不同倾角的侵彻来扩展压电锥贯入仪的应用范围，并提出斜贯入的一些基本方面（实验和理论），在斜贯入应用于实践之前，还有许多问题需要回答和解释方法需要发展。将研究倾斜角和土壤各向异性对锥阻力、套筒摩擦、产生的孔隙水压力及其消散的影响。采用有限元法对斜压锥贯入进行了分析。 这项研究的结果将为在无法进行垂直穿透的地点进行现场调查时，以及在需要水平或倾斜方向的强度和固结参数时，这项研究将对改善地下调查和引入一种新的斜压锥贯入试验技术产生重大影响，它的解释，以准确地评估土壤性质，更好的设计和分析。它也将有助于理解土壤的固有和诱导各向异性的影响，以便更好的解释方法可以开发。

***9907951TumayRapid growth and boom in surface construction and underground infrastructure inU.S. cities and suburbs increases the demand on geotechnical engineering.Geotechnical engineers are facing increasing challenges to improve in-situtesting tools for accurate site characterization of soil properties andefficient evaluation of geomedia improvement. The piezocone penetrometer test(PCPT) is a simple, fast, and repeatable test that can provide continuoussoundings of the subsurface. The PCPT test data can be effectively utilized forsoil stratigraphy and identification, and the evaluation of engineering soilproperties.The use of piezocone penetrometer for site investigation is currently limitedto vertical testing. The vertical intrusion of the cone penetrometer is notalways possible due to existing obstructions and/or lack of access. Moreover,in many cases the soil strength parameters and/or flow characteristics areneeded at an inclination plane due to the nature of soil (i.e. bedding,inclined foundation) or the alignment of reinforcing structure (i.e. soilnails, batter piles). The use of piezocone for inclined penetration has not yetbeen thoroughly investigated. The main objective of this research is to extend the application of piezoconepenetrometer by intrusion at different inclination angles, and to bring out thefundamental aspects (experimental and theoretical) of the inclined penetration.Many questions remain to be answered and interpretation methods need to bedeveloped before the inclined piezocone penetration is applied to practice. Theinfluence of the angle of inclination and soil anisotropy on the cone tipresistance, sleeve friction, generated pore pressures and their dissipationwill be investigated. The inclined piezocone penetration will be analyzed usingthe finite element methods. The outcome of this research will set the standardtowards the inclined use of the piezocone penetrometer for site investigationsin locations where it is impossible to perform vertical penetrations, andwhenever strength and consolidation parameters at a horizontal or inclineddirection are needed, as in soft ground tunneling.This research will have a significant impact toward improving subsurfaceinvestigation and introducing a new technique of inclined piezocone penetrationtesting and its interpretation to accurately evaluate soil properties forbetter design and analysis. It will also help in understanding the effect ofthe soil's inherent and induced anisotropy so that better interpretationmethods can be developed.***